Evidence that they’ve been trying to sell us high-technology razors since at least the 1930s (source):

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The Schermack Round Safety Razor is the first really efficient and safe razor for women–because it’s round. It fits all under-arm curves perfectly–any way you hold it. No sharp points or porjecting edges. Shaves faster–smooth and clean–yet with no danger of cutting delicate skin. Just what women have long been looking for.